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Path MTU Discovery

Configuring Path MTU Discovery on Outgoing TCP Connections

By default, path MTU discovery on outgoing TCP connections is enabled. To disable path MTU discovery, include the no-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:

To reenable path MTU discovery on outgoing TCP connections, include the path-mtu-discovery statement at the [edit system internet-options] hierarchy level:

Configuring IP-IP Path MTU Discovery on IP-IP Tunnel Connections

By default, path maximum transmission unit (MTU) discovery on outgoing IP-IP tunnel connections is enabled.

To disable IP-IP path MTU discovery, include the no-ipip-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:

To reenable IP-IP path MTU discovery, include the ipip-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:

Configuring Path MTU Discovery on Outgoing GRE Tunnel Connections

By default, path MTU discovery on outgoing GRE tunnel connections is enabled. To disable GRE path MTU discovery, include the no-gre-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:

To re-enable GRE path MTU discovery, include the gre-path-mtu-discovery statement at the [edit system internet-options] hierarchy level:

Note:

To verify details of the path MTU on outgoing GRE tunnels, use the command show interfaces (GRE).